Re: help with estimate row count from asktom

From: Yong Huang <yong321_at_yahoo.com>
Date: Wed, 31 Dec 2003 15:19:25 -0800
Message-ID: <F001.005DB5F5.20031231151925@fatcity.com>

One minor caveat about setting timed_os_statistics. On Solaris, if you set timed_os_statistics to non-zero, microstate accounting at the OS level is enabled for the server process. Common practice is to leave it off for performance reason. But I've never seen experimental data proving the negative effect of turning it on.

Yong Huang

Tanel Poder wrote:

Hi! Statistics level ALL means TYPICAL + row source execution stats + timed_os_statistics. If you want to switch to ALL for performance reasons, you can switch only row source stats on with parameter setting _rowsource_execution_statistics to true (on session level). But I doubt it'll help in current case anyway.

Tanel

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Author: Yong Huang
  INET: yong321_at_yahoo.com

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